Minor: remove confusing `update_plan_from_children` call from `EnforceSorting` #38562

Job	Run time
Check License Header	2m 27s
linux build test	4m 54s
build with wasm-pack	3m 28s
cargo test (macos-aarch64)	10m 25s
Check cargo fmt	36s
Verify MSRV (Min Supported Rust Version)	8m 0s
Verify Vendored Code	50s
cargo check no default features	8m 19s
cargo doc	4m 15s
cargo check datafusion	5m 20s
cargo check functions	2m 19s
cargo test (amd64)	16m 3s
cargo test doc (amd64)	18m 0s
cargo examples (amd64)	17m 18s
check Cargo.toml formatting	4m 17s
clippy	6m 47s
check configs.md and ***_functions.md is up-to-date	5m 8s
Run sqllogictest with Postgres runner	5m 57s
cargo test pyarrow (amd64)	4m 20s
verify benchmark results (amd64)	10m 3s
	2h 18m 46s

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